Just find a good way to convert pdf file to eps. This is quite useful when you edit a paper with Latex. Before we do it, we need to download the Texshop (http://pages.uoregon.edu/koch/texshop/):
To convert pdf → eps (Mac OS X will only do (e)ps → pdf & pdf → ps),
- open the pdf in TeXShop, choose the 'Selection' tool in the Preview window toolbar
- select the desired rectangle (or all, either with ⌘-A or manually),
- choose 'Preview>Save Selection to File...', & save as eps."
